Superhydrophobic composite films produced on various substrates

Panagiotis N. Manoudis, Ioannis Karapanagiotis, Andreas Tsakalof, Ioannis Zuburtikudis, Costas Panayiotou

Research output: Contribution to journalArticlepeer-review

232 Citations (Scopus)

Abstract

Hydrophilic silica (SiO2) nanoparticles were dispersed in solutions of poly(methyl methacrylate) (PMMA) and in solutions of a commercial poly(alkyl siloxane) (Rhodorsil 224), and the suspensions were sprayed on glass surfaces. The effect of the particle concentration on the hydrophobic character of PMMA-SiO2 and Rhodorsil-SiO2 films was investigated and showed the following: (i) Static contact angles (θS), measured on surfaces that were prepared from dilute dispersions (particle concentration < 1% w/v), increase rapidly with particle concentration and reach maximum values (154 and 164° for PMMA-SiO2 and siloxane-SiO2, respectively). Further increases in particle concentration do not have any effect on ΘS. (ii) The effect of particle concentration on the contact angle hysteresis (θAR) is more complicated: as the particle concentration increases, we first notice an increase in hysteresis, which then decreases and finally becomes constant at elevated particle concentrations. The lowest θA - θR values were 5° for PMMA-SiO2 and 3° for siloxane-SiO2, respectively, (iii) SEM and AFM images show that a two-length-scale hierarchical structure is formed on the surface of the superhydrophobic films. It is demonstrated that superhydrophobicity can be achieved using various hydrophilic nanoparticles (alumina and tin oxide nanoparticles were successfully tested) and that the substrate has almost no effect on the hydrophobic character of the applied coatings, which were produced on silicon, concrete, aluminum, silk, wood, marble, and of course glass. The results are discussed in light of Wenzel and Cassie-Baxter models.

Original languageEnglish
Pages (from-to)11225-11232
Number of pages8
JournalLangmuir
Volume24
Issue number19
DOIs
Publication statusPublished - Oct 7 2008

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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